Eyeglass-gage



No. 625,575. Patented M0 6, 1399.. L. A. STEVENSON.

EYEELASS GAGE.

(Appl cation filed Nov. 22, law (No Model.)

W/TNESSES [N VIE-N705;

62 Z. .22 fieverzso7z, W By W A7TORNEYS UNITn. STATES PATENT OFFICE.

IJEVI A. STEVENSON, OF GAYLORD, MICHIGAN.

EYEG LASS-GAG E.

SPECIFICATION forming part of Letters Patent No. 626,575, dated June 6, 1899.

Application filed November 22, 1898. $6Ii 6 77- (N0 model-l To a whom, it 77mg concern.-

Be it known that I, LEVI A. STEVENSON, of Gaylord,- in the county of Otsego and State of Michigan, have invented a new and useful Improvement in Eyeglass-Gages, of which the following is a specification.

My invent-ion is in the nature of a gage or measuring device to assist the oculist or optician in securing the exact distance apart and angular position for the' nose-clamps of eyeglasses, or for the proper spread for the bridge of spectacles; and it consists in a special construction and arrangement of calipers designed for this special use, as will be hereinafter more fully described with reference to the drawings, in which Figure 1 is a front view shown applied, and Fig. 2 a longitudinal section.

In the drawings, A A represent the two legs of the nose-calipers, which are pivoted together at (t and are fixed in their adjustments about this center bya set-screw I), passing through a curved slot 1), formed in one of the jaws and entering a screw-threaded hole in the other jaw.

B is a bowed spring passing around the butt-end of the calipers and screwed or otherwise attached at their ends to the legs of the calipers along their outside edges. The calipers near their ends are offset from the plane of their body portion, as seen in Fig. 2, and on their ends are detachably mounted nose-clamps c 0, similar to those used on eyeglasses. The ofiset in the calipers accommodates the projection of the forehead and allows the nose-clamps to fall inside the outer profile-line of the nose, as is necessary in getting the correct measurement. These noseclamps have little shanks that receive small screws 0', that enter sockets in the thickened ends of the calipers and detachably secure the'clamps thereto. These clamps may be made in difierent sizes and of diiferent angular positions to correspond to the different shapes and sizes of noses.

Extending across from one leg to the other of the calipers are slide-gages, one part (Z of which is attached pivotally to one leg and the other part cl to the other leg in approxil Inately right-angular position.

One of these sections (1 is marked with graduations and has two headed studs 6 at one end that play in a slot in the section d, and the latter has a head e, that clasps or embraces the edges of the other section, so as to keep the two sections in alinement as they slide one over the other. As shown, there are two of these slide-gages; but I may use only one, if desired.

To operate these calipers, they are held in a vertical position with the pivoted. ends of the calipers uppermost, and in such position the nose-pieces are pressed apart against the tension of the spring and fitted to the bridge of the nose. When so fitted, the calipers are fixed in this adjustment by tightening the set-screw, and the indication on gage being noted the nose-pieces of the eyeglasses or the bridge of the spectacles are adjusted to correspond.

Having thus described my invention,what

I claim as new, and desire to secure by Letters Patent, is

1. An eyeglass-gage consisting of a pair of hinged caliper-legs having their ends offset to a different plane from their body portions, and provided with nose-clamps, and one or more gage-bars located transversely on the legs between the nose-clamps and the pivotal center of the legs, said gage-bar consisting of two pieces, one piece attached to one leg and the other to the other leg, and the two pieces sliding telescopically over each other in the middle substantially as and for the purpose described.

2. An eyeglass-gage consisting of a pair of hinged caliper-legs having their ends oifset to a different plane from their. body portions, and provided with slot b and clamping-screw b and also with nose-clamps, one or more gagebars located. transversely on the legs between the nose-clamps and the pivotal center of the legs, and a bow-spring B encircling the pivot of the legs, and united at its ends to the two legs, substantially as shown and described.

LEVI A. STEVENSON.

\Vitnesses:

SAMUEL E. QUEE, GUSTAVE W. HARRIS. 

